remembrance held at freedom plaza. >> we've honored our first responders, as we well should, and i hope we can encourage more of your young people to become first responders and frankly, also, chris, to become teachers. >> reporter: as the mayor addressed the audience at the commemoration, john wesley watched from the sidelines. his fiancee, sara clark, was a d.c. teacher on the flight that crashed into the pentagon. why was it important for you to be here? >> because volunteerism was so important to sara, number one. and number two, volunteerism for me has been so important in my healing process since 9/11. >> reporter: lest we forget the u.s. capitol was a target of terrorism on that tragic day 11 years ago. the hijackers of united flight 93 intended to come here and crash into the capitol and might have done so were it not for the bravery of passengers on board. because of their efforts it crashed in an empty field in shanksville, pennsylvania, killing all 44 on board. >> the reality, this city may be targeted all the time.